If you’re on the hunt for a new pair of running kicks — or running anything, really — stop what you’re doing and dash over to Philadelphia Runner’s University City store (3621 Walnut Street) now. They’re having a flash sidewalk sale with tons of shoes and apparel, all for 50 percent off. Yep, everything is half-price. What the whaaaat?

If you can’t realistically drop everything you’re doing right now to shop — because, you know, you have a job and...